Impact of the satellite winds data from different sources is examined in the GEOS-5 forecast system. Study is focused on the impact of the current set of the satellite winds and will be evaluated with the adjoint models and denial observing system experiments. Both approaches should give us comprehensive information about the system a help us to understand overall impact of the satellite wind observations and their importance within the system.

Addition to this study will be comparison of observation impact with the NRL NOGAPS satellite wind dataset used within GEOS-5 forecast system. Two main differences between NRL and GMAO data sets will be addressed: first, amount of satellite winds used (much larger in the NRL NOGAPS system), second, use of "superobing" processing in the NRL system.